Move over, Lego: Kengo Kuma creates elegant, wooden Tsumiki blocks

Unlike Lego bricks, which are plastic, Tsumiki pieces are made of Japanese cedar (and manufactured using wood certified by the Forest Stewardship). And unlike the brick-shaped Lego blocks, each Tsumiki block is shaped like an inverted “V.” Triangular notches in the legs let the Tsumiki blocks wedge together, making them versatile like Lego bricks, albeit not as sturdy; some of the assembly models shown in Kuma’s Tsumiki brochure look about as solid as a house of cards.
— wired.com